Java Tutorial/Apache Common/DateUtils

DateUtil.Round

/* 
 * ========================================================================
 * 
 * Copyright 2005 Tim O"Brien.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * ========================================================================
 */
import java.util.Calendar;
import org.apache.rumons.lang.time.DateUtils;
public class MainClass {
    public static void main(String[] pArgs) throws Exception {
      Calendar cal = Calendar.getInstance();
      cal.set( 2004, 2, 5, 10, 2, 2 );
      
      System.out.println( DateUtils.round( cal.getTime() , DateUtils.SEMI_MONTH ) );
      
      
    }

}

Mon Mar 01 00:00:00 PST 2004

DateUtils.iterator

import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import org.apache.rumons.lang.time.DateUtils;
import org.apache.rumons.lang.time.StopWatch;
public class MainClass {
    public static void main(String[] args) {
      StopWatch stWatch = new StopWatch();
      //Start StopWatch
      stWatch.start();
      //Get iterator for all days in a week starting Monday
      Iterator itr = DateUtils.iterator(new Date(),
              DateUtils.RANGE_WEEK_MONDAY);
      while (itr.hasNext()) {
          Calendar gCal = (Calendar) itr.next();
          System.out.println(gCal.getTime());
      }
      //Stop StopWatch
      stWatch.stop();
      System.out.println("Time Taken >>" + stWatch.getTime());
    }
}

Mon May 07 00:00:00 PDT 2007
Tue May 08 00:00:00 PDT 2007
Wed May 09 00:00:00 PDT 2007
Thu May 10 00:00:00 PDT 2007
Fri May 11 00:00:00 PDT 2007
Sat May 12 00:00:00 PDT 2007
Sun May 13 00:00:00 PDT 2007
Time Taken >>32

DateUtils.Truncate

/* 
 * ========================================================================
 * 
 * Copyright 2005 Tim O"Brien.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * ========================================================================
 */
import java.util.Calendar;
import java.util.Date;
import org.apache.rumons.lang.time.DateFormatUtils;
import org.apache.rumons.lang.time.DateUtils;
public class MainClass {
  public static void main(String[] pArgs) throws Exception {
    Date now = new Date();
    Date truncYear = DateUtils.truncate(now, Calendar.YEAR);
    Date truncMonth = DateUtils.truncate(now, Calendar.MONTH);
    System.out.println("now: " + DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.format(now));
    System.out.println("truncYear: " + DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.format(truncYear));
    System.out.println("truncMonth: " + DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.format(truncMonth));
  }
}

now: 2007-05-08T15:59:12-07:00
truncYear: 2007-01-01T00:00:00-08:00
truncMonth: 2007-05-01T00:00:00-07:00